Diseased fish samples sought

Posted on April 02, 2013

UDN is a disease mainly affecting wild salmon, sea trout and brown trout. It usually occurs in adult fish returning from the sea and starts as small lesions on the scale-less regions of the fish, mainly the snout, above the eye and on/​above the gill cover. On entry to fresh water lesions ulcerate and may become infected. For further information please click the following link: